Threading problem

Joe - yes I think you are right about that. Still super excited I got this far!
I am like a blind squirrel looking for a nut. . .

If you are using Linux CNC 2.7.0 and get crappy looking exit moves at the end of the thread when using an exit taper (E>0 in the G76) - put an F0 prior to the G76. This will give a nice clean threads at the exit that progressively reduce in depth. If exiting into a relief groove using E0, you won't see this problem.

Looking at your video there definitely seems a pause at the end of the thread prior to the exit - but that could be you are just using E0 too with no relief groove.

Bug found in new trajectory planner which looks like it will be resolved soon. forum.linuxcnc.org/forum/20-g-code/29685...aper-linux-cnc-2-7-0 . 2.6.x does not have this issue.

Looks like you have been having similar fun to me by converting a machine that was not really designed to do this. Mine even less so being a Sherline! But haven't had to put the change gears on since!

Have fun!

I normally don't use exit taper or relief groove. With CNC you can run threads right up to a shoulder and retract reliably in a fraction of a spindle revolution.

You may need a relief groove in some cases to allow the mating part to pull up tight, of course.

I'm using tormachs pathpilot version which is based on 2.6 so I haven't see any weirdness that I didn't cause myself

Now that I have everything up and running here are my final ini/hal files - for anyone who needs them.

brianbonedoc wrote: I'm using tormachs pathpilot version which is based on 2.6 so I haven't see any weirdness that I didn't cause myself

Brianbonedoc when gcode is running in pathpilot lathe, does the rpm show in the RPM window? If yes then I have one more function to connect.

Thanks,

Iron-Man